What?!?! No Dazed and Confused. Matthew McConahey's best work. (Some might argue Ben Affleck's best, too.) No Fear and Loathing in Las Vegas?!?! Fat Benicio Del Toro, bald Johnny Depp! Outrage.
(I'm totally kidding, of course)
I'll go with Bill and Ted's. Haven't seen the others, although I wouldn't mind seeing Harold and Kumar.